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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Since you are using yunohost, this might be easy, though I'm also a newcomer in the selfhosting world. Yunohost comes already with nginx so you can use the Yunohost redirect app to forward to your nextcloudpi on the other raspberry.
NOTE:
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